2006 YAMAHA TTR50 Timing

4 - 23
ENGCYLINDER AND PISTON
CYLINDER AND PISTON
Extent of removal: 1 Cylinder removal
2 Piston removal
Extent of removal Order Part name Q ’ty Remarks
CYLINDER AND PISTON
REMOVAL
Preparation for removal Cylinder head Refer to “CYLINDER HEAD ” section.
1 Timing chain guide (exhaust) 1
2 Cylinder 1
3 Dowel pin 2
4 Gasket 1
5 Piston pin clip 2 Use special tool.
Refer to “REMOVAL POINTS ”.
6 Piston pin 1
7Piston 1
8 Piston ring (top) 1
Refer to “REMOVAL POINTS ”.
9 Piston ring (2nd) 1
10 Oil ring 1
2
1

4 - 28
ENGCYLINDER AND PISTON
2. Position:Top ring
 2nd ring
 Oil ring
Offset the piston ring end gaps as shown.
a Top ring
b Upper oil ring rail
c Oil ring expander
d Lower oil ring rail
e 2nd ring
f 20 mm (0.79 in)
È Intake side
3. Install:
Piston 1
 Piston pin 2
 Piston pin clips 3
NOTE:
Apply engine oil onto the piston pin, piston
ring and piston.
 Be sure that the arrow mark
a on the piston
points to the exhaust side of the engine.
 Before installing the piston pin clip, cover the
crankcase with a clean rag to prevent the
piston pin clip from falling into the crankcase.
4. Lubricate: Piston
 Piston rings
 Cylinder
NOTE:
Apply a liberal coating of engine oil.
Cylinder
1. Install:
Dowel pins
 Gasket
 Cylinder 1
NOTE:
Install the cylinder with one hand while com-
pressing the piston rings with the other hand.
CAUTION:
 Be careful not to damage the timing chain
damper during installation.
 Pass the timing chain through the timing
chain cavity.
e a
ff
d cb120
˚
120 ˚ 120˚
È
New
1
New

4 - 52
ENGCRANKCASE AND CRANKSHAFT
E
T R..10 Nm (1.0 m • kg, 7.2 ft • Ib)
T R..10 Nm (1.0 m •
kg, 7.2 ft • Ib)
LT
4
4 3
4
4
5 6
7
9
8
8
12
5 6
4
Extent of removal: 1 Timing chain removal
2 Crankcase separation
3 Crankshaft removal
Extent of removal Order Part name Q ’ty Remarks
Oil pump drive gear, oil pump and
oil strainer Refer to
“OIL PUMP ” section.
Shift shaft Refer to “SHIFT SHAFT ” section.
Rotor and starter clutch Refer to “AC MAGNETO AND
STARTER CLUTCH ” section.
1 Timing chain 1
2 Timing chain guide (intake) 1
3 Neutral switch 1
4 Bolt [40 mm (1.6 in)] 7
5 Bolt [60 mm (2.4 in)] 2
6 Bolt [75 mm (3.0 in)] 1
7 Left crankcase 1
8 Dowel pin 2
9 Crankshaft 1
2
1
3